Past terrestrial hydroclimate sensitivity controlled by Earth system feedbacks.
Past terrestrial hydroclimate sensitivity controlled by Earth system feedbacks.
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DOI：
10.1038/s41467-022-28814-7
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发表时间：
2022-03-14
影响因子：
16.6
通讯作者：
Peltier WR
中科院分区：
文献类型：
--
作者：
Feng R;Bhattacharya T;Otto-Bliesner BL;Brady EC;Haywood AM;Tindall JC;Hunter SJ;Abe-Ouchi A;Chan WL;Kageyama M;Contoux C;Guo C;Li X;Lohmann G;Stepanek C;Tan N;Zhang Q;Zhang Z;Han Z;Williams CJR;Lunt DJ;Dowsett HJ;Chandan D;Peltier WR
尽管构造条件和大气CO2水平（pCO 2）与现今相似，但上新世中期（3.3-3.0 Ma）的地质重建记录了萨赫勒地区的高湖泊水位和亚热带欧亚大陆的中纬度条件，表明在此期间亚热带陆地水文气候发生了剧烈的重组。在这里，使用代理数据和多模式古气候模拟汇编，我们表明，上新世中期水文气候状态是不是由直接的CO2辐射强迫，但由北方高纬度冰盖和大陆绿化的损失。这些冰盖和植被变化是地球系统对pCO 2升高的长期反馈。此外，在上新世中期，萨赫勒和亚热带欧亚大陆的潮湿条件是对流层湿度增加和地面变暖模式的驻波反应的产物，这与土地覆盖的变化有很大关系。这些研究结果强调了在长时间尺度上对持续的CO2强迫的放大陆地水文气候响应的潜力。与未来的预测相反，古气候记录往往发现湿润的亚热带与二氧化碳浓度升高相一致。在这里，一个汇编的代理和模拟被用来揭示气候动力学和反馈，负责在上新世中期产生湿亚热带。
Despite tectonic conditions and atmospheric CO2 levels (pCO2) similar to those of present-day, geological reconstructions from the mid-Pliocene (3.3-3.0 Ma) document high lake levels in the Sahel and mesic conditions in subtropical Eurasia, suggesting drastic reorganizations of subtropical terrestrial hydroclimate during this interval. Here, using a compilation of proxy data and multi-model paleoclimate simulations, we show that the mid-Pliocene hydroclimate state is not driven by direct CO2 radiative forcing but by a loss of northern high-latitude ice sheets and continental greening. These ice sheet and vegetation changes are long-term Earth system feedbacks to elevated pCO2. Further, the moist conditions in the Sahel and subtropical Eurasia during the mid-Pliocene are a product of enhanced tropospheric humidity and a stationary wave response to the surface warming pattern, which varies strongly with land cover changes. These findings highlight the potential for amplified terrestrial hydroclimate responses over long timescales to a sustained CO2 forcing. In contrast to future projections, paleoclimate records often find wetter subtropics in tandem with elevated CO2. Here, a compilation of proxies and simulations are used to reveal the climate dynamics and feedbacks responsible for generating wet subtropics during the mid-Pliocene.
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影响因子：
4.6
作者：
Armstrong, Edward;Valdes, Paul;Singarayer, Joy
通讯作者：
Singarayer, Joy
影响因子：
4.3
作者：
Chan, Wing-Le;Abe-Ouchi, Ayako
通讯作者：
Abe-Ouchi, Ayako
影响因子：
4.3
作者：
de Nooijer, Wesley;Zhang, Qiong;Brierley, Chris M.
通讯作者：
Brierley, Chris M.
影响因子：
4.3
作者：
Dowsett, Harry;Dolan, Aisling;Haywood, Alan
通讯作者：
Haywood, Alan
影响因子：
5.2
作者：
Broccoli, AJ;Dahl, KA;Stouffer, RJ
通讯作者：
Stouffer, RJ